Alternating-current transformer.



H. A. KBIP. ALTEBNATING-OURRENT TRANSFORMER.

APPLICATION FILED OUT. 1, 1908. 954,51 8. Patented Apr. 12, 1910.

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W6 tn wow I H. A. KEIP. ALTBBNAI'ING CURRENT TRANSFORMER.

APPLICATION TILED OOT. I 1908. v

latented Apr. 12,1910.

UNITED STATES PATENT OFFICE.

HEB-KAN A. KEIP, OF ROCHESTER, NEW YORK, ASSIGNOE T ELECTEO SURGICALINSTRUMENT COMPANY, OF ROCHESTER, NEW YORK, A CORPORATION roux.

To all whom it may concern:

. Rochester, in the county of Monroe and State of New York, haveinvented certain new and useful Improvements in Alternating-CurrentTransformers; and I do hereby declare the following to be a full, clear,and exact description of the same, reference being had to theaccompanying drawings, forming a part of this specification, and to thereferencenumerals marked thereon.

The present invention relates to alternating current transformers and ithas for an object to provide a compact construction adapted fortransforming the commercial current used for incandescent li hting intoa current that may be employed or medical or other purposes where adifierent voltage and ampera e is desired.

Another lation of the changed current to secure a great number ofdifferent voltages.

Still another object is to provide a device through which may beobtained either a current of high voltage and low amperage or a currentof low voltage and high amperage.

,To these and other ends the invention consists in certain improvementsand combinations of parts all as will be hereinafter more fullydescribed, the novel features being pointed out in the claims at the endof the specification.

In the drawings. Figures 1, 2 and 3 are views showing a portion of thecasing in vertical section and the other parts in side elevation, eachview being shifted relatively to the others; Figs. 1 and 5 arehorizontal sections 011 lines aa and bb respectively of Fig. 2; Fig. 6is a vertical section on line 0 c of Fig. 1; and Fig. 7 is adiagrammatic view illustrating the circuits.

The present embodiment of this invention employs a closed magnetic coreconsisting of a pair of upright portions or legs 1 and 2 and horizontalend portions 3 all of which are laminated. This core is preferablycarried by and between two insulators a and 5 which are in the form ofdisks grooved at (5 to receive the horizontal portions 3 of the core,the disks being held to the core preferably by tie rods 7 and nuts 7* arranged in pairs at the ends of the rods to engage opposite faces of thedisks.

Surrounding the upright 1 of the core is o bject is to provide for theregu- Specification of Letters Patent.

Application filed October 1, 1908. Serial No. 455,741.

01 NEW ,ALTEBNLTING-CUEBENT TRANSFORMER.

a primary coil 8 which has its terminal connected to two contacts 9 and10 arranged on the insulator 4, said contacts in this instance formingpart of an electric plug which is rigid relatively to the core in orderthat the transformer may be supported rigidly from the usualincandescent lamp socket. The contact 9 is externally screw threaded andrests against insulator 4, while contact 10 is formed by the head of abolt 11 that extends through hollow contact 9 and insulator 4 and hasits inner end flattened at 12 so that the insulator 13 and contact 9 areheld to insulator To this flattened end of the bolt 11 is secured oneterminal 14 of the primary coil and the other tern'iinal 15 is securedto contact 9.

The primary coil is surrounded by a secondary coil 90 and insulatedtherefrom by a sheet of insulation 16. The diameter of the wire formingthe secondary is greater than that of the primary and the secondary alsohas a fewer number of windings, thus producing a current of low voltageand a high amperage. The terminal 17 of this secondary is connected to abinding post 24 that is secured to and insulated from an open endcylinder 18 which surrounds the core and the coils thereon and engagesthe insulators 4 and 5 to form therewith a casing for the transformer.The other terminal of the secondary is formed by one of a series ofcontacts 19 arranged longitudinally of the secondary and formed brewhich the current shall flow and in this manner to reduce the voltageto the desired degree, there is employed a contact 20 preferably movablelongitudinally of the secondary. This contact may be constructed andoperated iii any suitable manner, but in the present instance it is inthe form of a spring finger carried by a nut 21 that travels on a quickpitch screw 22. The screw may be journaled in the insulators 4 and 5 andproject at one end through the insulator 5 to receive a thumb piece 23by which it is rotated. The contact 20 is held firmly against thecontacts 19 by engagement with a tie rod 7, the latter thus serving as aguide for the contact. This guide is electrically connected with abinding post 26 carried b the cylinder 18 in a manner to be describePatented Apr. 12, 1910.

and arranged that they are not liable to get The upright portion 2 ofthe core also is surrounded by a secondary coil 27 formed by a very linewire having numerous windings thus producing a current of high voltagcand low amperage. One terminal 28 of this coil is electrically connectedto a binding post 21), while the other terminal of the coil is formed byone of a longitudinal series of contacts 30 thereon to be engaged by amovable contact 31 which may be guided longitudinally of the coil on oneof the tie rods 7 and operated by a quick pitch screw 32 that isjournaled in insulators 4 and 5 and cooperates with a nut 32-} carriedby the contact 31. The screw extends to the outer face of the insulator5 and carries a thumb piece 34, on the rotation of which the contactwill be moved to cut in or out windings of the coil. The guide rod 7 iselectrically connected by conductor 38 to a binding post 35 which isarranged on'the cylinder and is electrically connected to the cylinderwhile a conductor 25 connects the guide rod 7 of contact 20 with guiderod 7 of contact 31.

In using this device, current may be supplied to a current consumingdevice having its terminals connected to. binding posts 2d: and 26 or tobinding posts 29 and 35. The current from binding posts 24 and 26 isespecially adapted for a cautery or other device requiring a very lowvoltage and high amperage while that obtained from binding posts 25) andis adapted for a lamp or other device where a high voltage and lowamperage is necessary.

From the foregoing it will thus be seen that there has been provided inone compact. structure a device which will supply from the commercialcurrent nearly any kind of current that may be desired. In operation itis simple and the parts are so constructed out of order.

I claim as my invention: 1. The combination With two insulators groovedon their opposed faces, of a core arranged between them and seated inthe grooves, tie rods connecting the insulators, a primary coilsurrounding the core, a pair of contacts carried by one insulator andconnected directly to the terminals of the primary coil, a secondarycoil surrounding the core, a pair of conductor securing devices carriedby the device and connected to the terminals of the secondary coil, andan open ended cylinder engaging both insulators and inclosing the coilsand the core.

2. In a transformer, the combination with a pair of insulators and aplug having two contacts connected to one of the insulators, of a coresecured between the insulators, a primary surrounding the core andhaving its terminals secured directly to the contacts of the plug, asecondary coil surrounding the core and provided with a longitudinalseries of contacts, a screw shaft journaled at its ends in theinsulators, a nut operated by the screw shaft, a contact to cooperatewith the longitudinal series of contacts operated by the nut, and a.pair of conductor securing devices one connected with the movablecontact and the other with the other terminal of the secondary coil.

3. In a transformer, the combination with a pair of insulators and aplug having two contacts and secured to one of the insulators, of aprimary coil arranged between the insulators 'and having its terminalsconnected directly to the contacts of the plug, a secondary coilarranged between the insulators and having a longitudinal series ofcontacts, tie rods connecting the insulators, a contact guided on one ofthe tie rods and cooperating with the longitudinal series of contactsonthe secondary coil, and means for moving said contact to cause thelatter to cooperate with different contacts on the secondary coil.

HERMAN A. KEIP.

lVitnesses:

RUSSELL B. GRIFFITH, HAROLD H. SIMMs.

